The Big Plan is almost presented as just "do the Big Plan, and your done," at least in various places in the book. And it does work if you do it, but there in lies the problem. We still have to deal with OK, but how? The book spends many pages sort of explaining it, and that is helpful. But most of carrying out the plan is something we must find in ourselves. This requires another plan with the directions on how to do the Big Plan.
The Big Plan is fundamentally sound. It's the essence of recovery in its simplest terms, but let's face it, getting started is seldom that easy for anyone.